JP2012155264A - Optical resin composition, method of manufacturing device for image display using the composition, and device for image display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical resin composition which sufficiently advances in curing even under a thermal curing condition of 65°C or below even for a substrate provided with a light shield part in a process of manufacturing a device for image display in which the resin composition is cured after being charged in a space of a display device (between a protection plate and a liquid crystal display device, between the protection plate and a touch panel, and between the touch panel and liquid crystal display device) while liquid to be easy to handle at room temperature, and to provide the device for image display which has shock resistance and provides a sharp high-contrast image with no ghost.SOLUTION: The optical resin composition includes (A) a (meth)acrylic acid-based derivative polymer, (B) an oligomer having two or more ethylenically unsaturated bonds in a molecule, (C) a monomer having one ethylenically unsaturated bond in a molecule, (D) a photoinitiator, and (D) an organic peroxide which has a 10-hour half-life period temperature of 40-70°C and a theoretical active oxygen amount of 8% or lower.

Description

The present invention relates to an optical resin composition that is useful for preventing cracking of an image display device, relaxing stress and impact, and having excellent transparency, a method for producing an image display device using the composition, and an image display device. In particular, the present invention relates to an improvement in a method for curing a resin composition filled between substrates having a light shielding portion.
A liquid crystal display device is exemplified as a typical image display device (panel). A liquid crystal display device includes a liquid crystal cell in which liquid crystal is filled and sealed through a gap of about several microns between a glass substrate having a thickness of about 1 mm on which transparent electrodes, pixel patterns, etc. are formed, and both outer surfaces thereof. It is a thin and easily scratched display part made of an optical film such as a polarizing plate attached to the surface.
For this reason, in particular, for mobile phones, game machines, digital cameras, in-vehicle applications, etc., a liquid crystal display device having a structure in which a transparent front plate (protective panel) is provided with a certain space in front of the liquid crystal display device is generally used. Has been used.

Furthermore, in recent years, touch panels have been mounted on mobile phones, game machines, digital cameras, in-vehicle components, notebook computers, desktop computers, personal computer monitors, and the like. Such a display device has a laminated structure of a front plate, a touch panel, and a liquid crystal image display device, and air is interposed between the front plate and the touch panel, and between the touch panel and the liquid crystal image display device. These spaces cause light scattering, resulting in a decrease in contrast and brightness.
In addition, the current large liquid crystal display generally has an anti-glare (AG) treatment on the front polarizing plate surface of the liquid crystal panel to reduce reflection. In the case of this configuration, no special measures are taken with respect to shock absorption, and the entire panel and the structure as a set are provided with impact resistance.
The problem with this configuration is that the image looks blurred due to AG processing, the panel is bent when touching the surface, the image is distorted, and it is difficult to remove dirt due to AG processing, and it is easy to get scratched. As the size of the panel increases, the impact resistance of the panel may decrease, and a problem may occur in the impact resistance.
In view of this, it is conceivable that a front plate subjected to anti-reflection (AR) processing is placed in front of the liquid crystal panel to eliminate the disadvantages derived from AG processing.
However, when the space between the front plate and the liquid crystal panel is air, there may be a decrease in transmittance and a decrease in image quality due to double projection, and it has been proposed to fill the space with resin or the like (for example, Patent Documents). 1-4).

Glass cathode ray tubes (CRT) are determined to be non-scattering or not penetrated by an impact resistance test by dropping a steel ball according to UL standards or radio wave control methods for televisions and displays. In order to satisfy this standard, it was necessary to design the CRT glass to be thick, and the weight of the CRT was increased.
Then, the method of laminating | stacking the synthetic resin protective film which has a self-restoration property on glass as a means to give scattering prevention property without making glass thick is proposed (for example, refer patent document 5 and 6).
However, although this proposal is characterized by anti-scattering properties, it does not have a function of preventing glass from breaking.
On the other hand, the PDP, which is one of the flat panel displays (FPD), has a space of about 1 to 5 mm from the PDP to prevent cracking of the PDP, and a front plate such as a glass of about 3 mm in thickness on the front (viewing surface). Side). For this reason, as the PDP is increased in size, the area of the front plate is also increased, which increases the weight of the PDP.
Therefore, in order to prevent cracking of the display, it has been proposed to laminate a specific resin on the display surface or to laminate an optical filter on which the specific resin is laminated on the display surface (see, for example, Patent Documents 7 to 10). ).
However, the oil used in Patent Document 1 is difficult to seal in order to prevent leakage, and there is a possibility that the material used in the liquid crystal panel may be eroded, so that the oil leaks when the front plate is cracked. There's a problem.
Further, the unsaturated polyester of Patent Document 2 tends to be colored yellow, and application to a display device is not desirable.
The silicone of Patent Document 3 has a low adhesive force and requires a separate pressure-sensitive adhesive for fixing, and the process becomes complicated. Further, since the adhesive force with the pressure-sensitive adhesive is not so large, it peels off when an impact is applied. There is a problem that air bubbles enter.
The polymer of the acrylic monomer of Patent Document 4 has a low adhesive force and does not require a separate adhesive for small devices, but requires a separate adhesive to support the front panel of a large display, and the process It becomes complicated. In addition, since the raw material is composed only of the monomer, the viscosity is low, and the curing shrinkage is large, so that it is difficult to uniformly produce a film having a large area.
In Patent Documents 7 and 8, there is no particular consideration regarding the composition of the resin material to be used, and the means for expressing adhesiveness and transparency is unclear. In particular, in Patent Document 7, there is no consideration on the moisture resistance reliability of the resin, and the resin material having the composition specifically shown in the examples becomes cloudy in a short time moisture resistance test after being applied to a display.
Also, in Patent Document 8, acrylic acid is used as a part of the resin specifically shown in the examples, and the resin becomes cloudy in a long-time moisture resistance test, and is in contact with the metal during the moisture resistance test. This causes the problem of corroding.
Furthermore, in patent documents 7 and 8, it is thought that examination is inadequate from a viewpoint of obtaining the more outstanding impact absorbability.
In Patent Document 8, the thickness of the impact-resistant layer using a resin is set to 0.2 to 1 mm, but there is no disclosure from the viewpoint of increasing the thickness and improving the impact absorbability.
In Patent Document 9, consideration is given to heat-and-moisture resistance, but the resin material composition described in this patent document cannot be expected to significantly improve impact resistance.
Moreover, the thickness of the resin layer in an Example is 1 mm, and it is thought that examination is inadequate from a viewpoint of obtaining the more outstanding impact absorbability.
In addition, as described in the example of Patent Document 9, if a soft resin after curing is used thickly, the surface hardness of the front filter is lowered, which may cause a problem in scratch resistance. Conceivable.
Further, when the heating upper limit temperature of the display is required to be 65 ° C. or less, the composition described in the example of Patent Document 10 has a problem that the curing of the resin composition around the light shielding portion does not proceed sufficiently. Come.

JP 05-011239 A Japanese Patent Laid-Open No. 03-204616 Japanese Patent Laid-Open No. 06-059253 JP 2004-125868 A Japanese Patent Laid-Open No. 06-333515 Japanese Patent Laid-Open No. 06-333517 JP 2004-058376 A JP 2005-107199 A JP 2004-263084 A JP 2009-186960 A

In the image display device, a light shielding portion on the frame may be provided for the purpose of improving the contrast of the display image and blocking unnecessary light of the display panel.
When the optical resin composition is filled between the substrates provided with the light-shielding portions, the light does not reach sufficiently and a problem that hinders curing occurs.
In the case where the periphery of the light-shielding portion is cured by heat, a polarizing plate with low heat resistance or the like has restrictions on thermosetting conditions, and generally a condition of 65 ° C. or lower is essential.
There are many known polymerization initiators contained in thermosetting resin compositions that start polymerization at low temperatures, but when the polymerization start temperature is below room temperature, the resin composition manufacturing process and the handling of the resin composition Temperature control is required.
The present invention provides a liquid resin composition that is easy to handle at room temperature in the space of the display device (between the protective plate and the liquid crystal display device, between the protective plate and the touch panel, and between the touch panel and the liquid crystal display device). In the manufacturing process of an image display device that is cured after being filled, an optical resin composition capable of sufficiently proceeding with curing even under a heat curing condition of 65 ° C. or lower, even in the case of a substrate provided with a light shielding portion. This is the first purpose.
The present invention also provides a method of manufacturing an image display device that has impact resistance, does not have double image, and can provide a clear and high-contrast image, and an image display device obtained thereby. It is intended.

The optical resin composition according to the present invention comprises (A) (meth) acrylic acid derivative polymer, (B) an oligomer having two or more ethylenically unsaturated bonds in the molecule, and (C) one in the molecule. A monomer having an ethylenically unsaturated bond, (D) a photopolymerization initiator, and (E) an organic peroxide having a 10-hour half-life temperature of 40 to 70 ° C. and a theoretical active oxygen content of 8% or less, It is characterized by including.
In the optical resin composition, the organic peroxide content of the component (E) is 0.5 to 5 parts by mass with respect to 100 parts by mass of the total amount of the components (A) to (E). It is preferable. Thereby, sclerosis | hardenability and wet heat-resistant reliability can be made more excellent.
In the optical resin composition, the (meth) acrylic acid derivative polymer of the component (A) is an alkyl acrylate having an alkyl group with 4 to 18 carbon atoms and the following general formula (I):

（ただし、一般式（Ｉ）中、ｍは２、３又は４、ｎは１〜１０の整数を示す。）で表されるヒドロキシル基含有アクリレートの共重合体であることが好ましい。これにより、硬化収縮率をより低減できる。
また、前記光学用樹脂組成物は、（Ｂ）成分の分子内に２個以上のエチレン性不飽和結合を有するオリゴマーが、２個以上の（メタ）アクリロイル基を有するウレタンオリゴマーであることが好ましい。これにより、硬化性、密着性及び伸び率をより優れたものにすることができる。
また、本発明による画像表示用装置の製造方法は、画像表示部を有する画像表示ユニットと保護パネルとを対向配置し、これらの間に前記光学用樹脂組成物を介在させて、該光学用樹脂組成物を硬化させる画像表示用装置の製造方法であって、前記保護パネルが外周縁に沿って遮光部が形成されており、前記画像表示ユニットと保護パネル間の光学用樹脂組成物に対して、（１）少なくとも前記保護パネル面側から光照射を行う工程、（２）画像表示用装置を６５℃以下で加熱する工程と、を含むことを特徴とする。
また、本発明による画像表示装置は、前記製造方法により製造されることを特徴とする。

(However, in general formula (I), m is 2, 3, or 4, n is an integer of 1-10.) It is preferable that it is a copolymer of the hydroxyl group containing acrylate represented. Thereby, hardening shrinkage rate can be reduced more.
In the optical resin composition, the oligomer having two or more ethylenically unsaturated bonds in the molecule of the component (B) is preferably a urethane oligomer having two or more (meth) acryloyl groups. . Thereby, sclerosis | hardenability, adhesiveness, and elongation can be made more excellent.
The method for producing an image display device according to the present invention comprises an image display unit having an image display unit and a protective panel disposed opposite to each other, the optical resin composition interposed therebetween, and the optical resin. A method for manufacturing an image display device for curing a composition, wherein the protective panel is formed with a light shielding portion along an outer peripheral edge, and the optical resin composition between the image display unit and the protective panel (1) A step of performing light irradiation at least from the protective panel surface side, and (2) a step of heating the image display device at 65 ° C. or lower.
The image display device according to the present invention is manufactured by the manufacturing method.

According to the present invention, it is a liquid and easy-to-handle room temperature image display device space (between the protective plate and the liquid crystal display device, between the protective plate and the touch panel, and between the touch panel and the liquid crystal display device). In the manufacturing process of an image display device that is cured after being filled with the liquid resin composition, even in the case of a substrate provided with a light-shielding part, the optical material that can sufficiently cure under a thermosetting condition of 65 ° C. or less. A resin composition can be provided.
In addition, according to the present invention, it is possible to provide an image display device that has impact resistance, can produce a clear and high-contrast image without double image.

DESCRIPTION OF EMBODIMENTS Hereinafter, an optical resin composition according to the present invention, a method for producing an image display device using the same, and an image display device will be described in detail by embodiments. In addition, this invention is not limited by this embodiment.
In this specification, “(meth) acrylate” means “acrylate” and “methacrylate” corresponding thereto. Similarly, “(meth) acryl” means “acryl” and “methacryl” corresponding thereto, and “(meth) acryloyl” means “acryloyl” and corresponding “methacryloyl”.
The optical resin composition according to the present invention comprises (A) (meth) acrylic acid derivative polymer, (B) an oligomer having two or more ethylenically unsaturated bonds in the molecule, and (C) one in the molecule. A monomer having an ethylenically unsaturated bond, (D) a photopolymerization initiator, and (E) an organic peroxide having a 10-hour half-life temperature of 40 to 70 ° C. and a theoretical active oxygen content of 8% or less. contains.

Hereinafter, each component will be described.
<(A) component; (meth) acrylic acid derivative polymer>
The (meth) acrylic acid derivative polymer in the present invention is a (meth) acrylic acid derivative having one ethylenically unsaturated bond in the molecule (hereinafter sometimes simply referred to as a (meth) acrylic acid derivative). A monomer obtained by polymerization and having two or more ethylenically unsaturated bonds in the molecule may be used in combination. The weight average molecular weight (measured using a standard polystyrene calibration curve by gel permeation chromatography) is preferably 5,000 to 40,000, more preferably 7,000 to 30,000, 000 to 25,000 is particularly preferable.
By setting the weight average molecular weight to 5,000 or more, it is possible to obtain an adhesive force that does not cause peeling in a high temperature and high humidity environment.
Moreover, by making it less than 40,000, the viscosity of the optical resin composition does not become too high, dispensing to the substrate is facilitated, and (C) one ethylenically unsaturated bond in the molecule described later. By reducing the addition amount of the monomer having, the curing shrinkage rate can be reduced.

The (meth) acrylic acid derivative polymer may be a polymer obtained by polymerization using a monomer other than the (meth) acrylic acid derivative.
Examples of the (meth) acrylic acid derivative include acrylic acid or methacrylic acid, and derivatives thereof. Specifically, monomers having one ethylenically unsaturated bond in the molecule include methyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, 2-ethylhexyl methacrylate, isononyl methacrylate, n-octyl methacrylate, lauryl methacrylate. , Alkyl methacrylates such as stearyl methacrylate, methyl acrylate, n-butyl acrylate, i-butyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, n-octyl acrylate and other alkyl acrylates, benzyl methacrylate and other aralkyl methacrylates, benzyl acrylate and the like Alkoxyalkyl methacrylates such as aralkyl acrylate and butoxyethyl methacrylate, butoxyethyl acetate Alkoxyalkyl acrylate such as rate, aminoalkyl methacrylate such as N, N-dimethylaminoethyl methacrylate, aminoalkyl acrylate such as N, N-dimethylaminoethyl acrylate, methacrylic acid ester of diethylene glycol ethyl ether, methacrylic acid of triethylene glycol butyl ether Esters, methacrylates of polyalkylene glycol alkyl ethers such as methacrylates of dipropylene glycol methyl ether, acrylic esters of diethylene glycol ethyl ether, acrylic esters of triethylene glycol butyl ether, acrylic esters of dipropylene glycol methyl ether, etc. Polyalkylene glycol alkyl ether acrylates Methacrylic acid ester of polyalkylene glycol aryl ether such as methacrylic acid ester of hexaethylene glycol phenyl ether, acrylic acid ester of polyalkylene glycol aryl ether such as acrylic acid ester of hexaethylene glycol phenyl ether, cyclohexyl methacrylate, cyclohexyl acrylate, Methacrylic acid ester or acrylic acid ester having an alicyclic group such as dicyclopentanyl methacrylate, dicyclopentanyl acrylate, isobornyl methacrylate, methoxylated cyclodecatriene methacrylate, isobornyl acrylate, methoxylated cyclodecatriene acrylate , Fluorinated alkyl methacrylates such as heptadecafluorodecyl methacrylate, heptade Fluorinated alkyl acrylates such as cafluorodecyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, glycerol methacrylate, Methacrylic acid ester or acrylic acid ester having a hydroxyl group such as glycerol acrylate, Methacrylic acid ester or acrylic acid ester having a carboxyl group such as acrylic acid or methacrylic acid, Methacrylic acid ester or acrylic having a glycidyl group such as glycidyl methacrylate or glycidyl acrylate Examples include acid esters and acrylamides. These can be used alone or in combination of two or more.
These monomers having one ethylenically unsaturated bond in the molecule can be used alone or in combination of two or more.

  In addition to the above (meth) acrylic acid derivatives, monomers having one polymerizable unsaturated bond in the molecule such as acrylonitrile, styrene, vinyl acetate, ethylene and propylene can be used. In addition, monomers other than the acrylic acid derivatives described above and having two or more polymerizable unsaturated bonds in the molecule (such as divinylbenzene) can also be used.

  In the present invention, the (meth) acrylic acid derivative polymer has an alkyl acrylate having an alkyl group having 4 to 18 carbon atoms and the following general formula (I) from the viewpoint of reducing the curing shrinkage rate.

（ただし、一般式（Ｉ）中、ｍは２、３又は４、ｎは１〜１０の整数を示す。）で表されるヒドロキシル基含有アクリレートの共重合体であることが好ましい。
アルキル基の炭素数が４〜１８であるアルキルアクリレートの共重合割合は、（メタ）アクリル酸系誘導体ポリマー中、３０〜８０モル％が好ましく、４０〜７０モル％がより好ましく、４５〜６０モル％が特に好ましい。
一般式（Ｉ）の共重合割合は、（メタ）アクリル酸系誘導体ポリマー中、２０〜７０モル％が好ましく、３０〜６０モル％がより好ましく、４０〜５５モル％が特に好ましい。
本発明に用いる（Ａ）（メタ）アクリル酸系誘導体ポリマーの含有量は、硬化性、密着性及び硬化収縮率の観点から、光学用樹脂組成物の総量１００質量部に対して、１０〜５０質量部が好ましく、１５〜４０質量部であることがより好ましく、２０〜３０質量部であることが特に好ましい。

(However, in general formula (I), m is 2, 3, or 4, n is an integer of 1-10.) It is preferable that it is a copolymer of the hydroxyl group containing acrylate represented.
The copolymerization ratio of the alkyl acrylate having 4 to 18 carbon atoms in the alkyl group is preferably 30 to 80 mol%, more preferably 40 to 70 mol% in the (meth) acrylic acid derivative polymer, and 45 to 60 mol. % Is particularly preferred.
The copolymerization ratio of the general formula (I) is preferably 20 to 70 mol%, more preferably 30 to 60 mol%, and particularly preferably 40 to 55 mol% in the (meth) acrylic acid derivative polymer.
The content of the (A) (meth) acrylic acid derivative polymer used in the present invention is 10 to 50 with respect to 100 parts by mass of the total amount of the optical resin composition from the viewpoints of curability, adhesion and cure shrinkage. A mass part is preferable, It is more preferable that it is 15-40 mass parts, It is especially preferable that it is 20-30 mass parts.

<(B) component: oligomer having two or more ethylenically unsaturated bonds in the molecule>
Examples of oligomers having two or more ethylenically unsaturated bonds in the molecule include polyester oligomers having two or more (meth) acryloyl groups, urethane oligomers having two or more (meth) acryloyl groups, polyethylene glycol di ( And (meth) acrylate and polyprolene glycol di (meth) acrylate.
Among these, a urethane oligomer having two or more (meth) acryloyl groups is preferable from the viewpoint of balance of various properties.
The urethane oligomer having two or more (meth) acryloyl groups is, for example, a compound obtained by reacting (a1) a diol compound and (a2) a compound having an isocyanate group (hereinafter sometimes referred to as a urethane oligomer). ) To (a3) monohydroxy (meth) acrylate, (a4) monocarboxylic acid having (meth) acryloyl group, or monoisocyanate compound having (meth) acryloyl group. .

  (A1) Examples of the diol compound include polyether diols such as polyethylene glycol and polypropylene glycol, polybutadiene diols, polyisoprene diols, hydrogenated polybutadiene diols, hydrogenated polyisoprene diols and other polyolefin diols, polyester diols, polycaprolactone diols, Examples thereof include silicone diol. Among these, polyether diol is preferable from the viewpoints of stress / impact relaxation, transparency, and adhesiveness.

  Examples of the compound (a2) having an isocyanate group include diisocyanate compounds represented by the following general formula (II).

（一般式（ＩＩ）中、Ｘは２価の有機基を示す。）
上記一般式（ＩＩ）中のＸで示される２価の有機基としては、例えば、炭素数１〜２０のアルキレン基、未置換若しくはメチル基等の炭素数１〜５の低級アルキル基で置換されているフェニレン基及びナフチレン基等のアリーレン基が挙げられる。アルキレン基の炭素数は、より好ましくは１〜１８である。また、上記Ｘで示される２価の有機基としては、フェニレン基、キシリレン基、ナフチレン基、ジフェニルメタン−４，４’−ジイル基、ジフェニルスルホン−４，４’−ジイル基等の芳香環を有する基が好ましいものとして挙げられる。また、水添ジフェニルメタン−４，４’−ジイル基も好ましいものとして挙げられる。

(In general formula (II), X represents a divalent organic group.)
Examples of the divalent organic group represented by X in the general formula (II) include, for example, an alkylene group having 1 to 20 carbon atoms, an unsubstituted group, or a lower alkyl group having 1 to 5 carbon atoms such as a methyl group. And arylene groups such as a phenylene group and a naphthylene group. The number of carbon atoms of the alkylene group is more preferably 1-18. The divalent organic group represented by X has an aromatic ring such as a phenylene group, a xylylene group, a naphthylene group, a diphenylmethane-4,4′-diyl group, a diphenylsulfone-4,4′-diyl group. Groups are preferred. A hydrogenated diphenylmethane-4,4′-diyl group is also preferred.

Examples of the diisocyanates represented by the general formula (II) include diphenylmethane-2,4′-diisocyanate; 3,2′-, 3,3′-, 4,2′-, 4,3 ′. -, 5,2'-, 5,3'-, 6,2'- or 6,3'-dimethyldiphenylmethane-2,4'-diisocyanate;3,2'-,3,3'-, 4,2 '-, 4,3'-, 5,2'-, 5,3'-, 6,2'- or 6,3'-diethyldiphenylmethane-2,4'-diisocyanate;3,2'-, 3, 3'-, 4,2'-, 4,3'-, 5,2'-, 5,3'-, 6,2'- or 6,3'-dimethoxydiphenylmethane-2,4'-diisocyanate; diphenylmethane -4,4'-diisocyanate;diphenylmethane-3,3'-diisocyanate;diphenylmethane-3,4'-diisocyanate Diphenylmethane diisocyanate compounds and hydrogenated products thereof; diphenyl ether-4,4′-diisocyanate; benzophenone-4,4′-diisocyanate; diphenylsulfone-4,4′-diisocyanate; tolylene-2,4-diisocyanate; tolylene-2, 6-diisocyanate; m-xylylene diisocyanate; p-xylylene diisocyanate; 1,5-naphthalene diisocyanate; 4,4 '-[2,2bis (4-phenoxyphenyl) propane] diisocyanate; tolylene diisocyanate; hexamethylene diisocyanate 2,2,4-trimethylhexamethylene diisocyanate; isophorone diisocyanate; 4,4′-dicyclohexylmethane diisocyanate; transcyclohexane-1,4-dii Cyanate; hydrogenated m- xylylene diisocyanate, aliphatic or alicyclic isocyanates such lysine diisocyanate. As these diisocyanates, it is preferable to use an aliphatic diisocyanate compound in which X in the general formula (II) is a group having an aliphatic group. These can be used alone or in combination of two or more. In addition, as the compound having an isocyanate group, a tri- or higher functional polyisocyanate may be used together with the diisocyanate represented by the general formula (II).
The diisocyanates represented by the general formula (II) may be stabilized with a blocking agent necessary for avoiding changes over time. Examples of the blocking agent include hydroxy acrylate, alcohol typified by methanol, phenol, oxime and the like, but there is no particular limitation.

The blending ratio when the (a1) diol compound and the diisocyanate represented by the general formula (II) are reacted is the number average molecular weight of the urethane oligomer to be produced and the terminal of the urethane oligomer to be produced is a hydroxyl group. Or an isocyanate group.
When the end of the urethane oligomer is an isocyanate group, the ratio of the number of isocyanate groups to the number of hydroxyl groups (number of isocyanate groups / number of hydroxyl groups) is preferably adjusted to be 1.01 or more, from the viewpoint of increasing the number average molecular weight. Is preferably adjusted to less than 2. By setting such a ratio, a urethane oligomer having an isocyanate group at the end can be obtained.

Examples of the compound for introducing the (meth) acryloyl skeleton include (a3) monohydroxy (meth) acrylate compound.
Examples of the (a3) monohydroxy (meth) acrylate compound include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 1,4-cyclohexanedimethanol. Mono (meth) acrylate, caprolactone or alkylene oxide adduct of each of the above (meth) acrylates, glycerin di (meth) acrylate, trimethylol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) Examples include acrylate, ditrimethylolpropane tri (meth) acrylate, and 2-acryloxyethanol. These monohydroxy compounds can be used alone or in combination of two or more.

On the other hand, when the terminal of the urethane oligomer is a hydroxyl group, it is preferable to adjust the blending ratio so that the ratio between the number of hydroxyl groups and the number of isocyanate groups (number of hydroxyl groups / isocyanate groups) is 1.01 or more. From the viewpoint of increasing, it is preferable to adjust to less than 2.
When the terminal of the urethane oligomer is a hydroxyl group, monocarboxylic acids having a (meth) acryloyl group such as (meth) acrylic acid, monoisocyanate compounds having a (meth) acryloyl group such as 2-isocyanatoethyl (meth) acrylate, etc. A urethane oligomer having two (meth) acryloyl groups can be obtained by reacting a compound capable of reacting with a hydroxyl group with a hydroxyl group at the terminal of the urethane oligomer.

In the present invention, the weight average molecular weight of the oligomer having two or more ethylenically unsaturated bonds in the molecule as the component (B) is 1,000 to 40 from the viewpoints of curability, flexibility, and workability. Is preferably 3,000 to 30,000, more preferably 3,000 to 30,000, and particularly preferably 5,000 to 20,000.
The content of the oligomer (B) having two or more ethylenically unsaturated bonds in the molecule used in the present invention is 100 parts by mass of the total amount of the optical resin composition from the viewpoints of curability, adhesion and cure shrinkage. Is preferably 10 to 50 parts by mass, more preferably 15 to 45 parts by mass, and particularly preferably 20 to 40 parts by mass.

<(C) component; monomer having one ethylenically unsaturated bond in the molecule>
In the present invention, the monomer (C) having one ethylenically unsaturated bond in the molecule is preferably a compound having one (meth) acryloyl group in the molecule, and (c1) the alkyl group has 4 to 4 carbon atoms. It is preferable to contain (meth) acrylate etc. containing polar groups, such as the alkyl (meth) acrylate which is 18 and (c2) hydroxyl group, a morpholine group.
(C2) Polar groups such as a hydroxyl group and a morpholine group form a hydrogen bond with an interface of an adherend such as glass. Therefore, by mixing them, it is possible to obtain an adhesive force with excellent wet heat resistance. .

  As said (c1) alkyl (meth) acrylate whose carbon number of an alkyl group is 4-18, n-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2- Examples include ethyl hexyl acrylate, dodecyl acrylate, stearyl acrylate, and the like. N-butyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, and n-octyl acrylate are preferable, and ethyl hexyl acrylate is particularly preferable. These acrylates may be used in combination of two or more.

  Examples of the acrylate having a polar group such as (c2) hydroxyl group and morpholine group include 2-hydroxyethyl acrylate, 1-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 1-hydroxypropyl acrylate, 4 -Hydroxyl-containing acrylates such as hydroxybutyl acrylate, 3-hydroxybutyl acrylate, 2-hydroxybutyl acrylate, 1-hydroxybutyl acrylate and hydroxyethyl acrylamide, polyethylene glycol monoacrylates such as diethylene glycol and triethylene glycol, dipropylene glycol and tripropylene Polypropylene glycol monoacrylate such as glycol, dibutylene glycol and tributylene glycol Polybutylene glycol monoacrylate such as acryl, morpholine group-containing acrylate such as acryloyl morpholine, etc., but from the viewpoint of workability during coating, 4-hydroxybutyl acrylate, acryloyl morpholine, hydroxyethyl acrylamide with low skin irritation An acrylate such as These acrylates may be used in combination of two or more. Examples of the methacrylate having a polar group such as a hydroxyl group and a morpholine group include methacrylates corresponding to the above acrylates.

  The content of the monomer (C) having one ethylenically unsaturated bond in the molecule used in the present invention is 100 parts by mass in total of the optical resin composition from the viewpoints of adhesion, workability, and curing shrinkage. On the other hand, 10-50 mass parts is preferable, it is more preferable that it is 15-45 mass parts, and it is especially preferable that it is 20-40 mass parts.

<(D) component: Photopolymerization initiator>
Examples of the photopolymerization initiator in the present invention include benzophenone, N, N′-tetramethyl-4,4′-diaminobenzophenone (Michler ketone), N, N-tetraethyl-4,4′-diaminobenzophenone, 4-methoxy. -4′-dimethylaminobenzophenone, α-hydroxyisobutylphenone, 2-ethylanthraquinone, t-butylanthraquinone, 1,4-dimethylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chloro-2-methyl Anthraquinone, 1,2-benzoanthraquinone, 2-phenylanthraquinone, 1,4-naphthoquinone, 9,10-phenanthraquinone, thioxanthone, 2-chlorothioxanthone, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy- , 2-diphenylethane-1-one, aromatic ketone compounds such as 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzoin compounds such as benzoin, methylbenzoin, and ethylbenzoin, benzoin methyl ether, benzoin Benzoin ether compounds such as ethyl ether, benzoin isobutyl ether, benzoin phenyl ether, benzyl, 2,2-diethoxyacetophenone, benzyldimethyl ketal, ester compound of β- (acridin-9-yl) acrylic acid, 9-phenylacridine, Acridine compounds such as 9-pyridylacridine, 1,7-diacridinoheptane, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di ( m-methoxyph Phenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-diphenylimidazole dimer, 2- (o-methoxyphenyl) -4,5-diphenylimidazole dimer, 2- (p- Methoxyphenyl) -4,5-diphenylimidazole dimer, 2,4-di (p-methoxyphenyl) 5-phenylimidazole dimer, 2- (2,4-dimethoxyphenyl) -4,5-diphenylimidazole Dimer, 2,4,5-triarylimidazole dimer such as 2- (p-methylmercaptophenyl) -4,5-diphenylimidazole dimer, 2-benzyl-2-dimethylamino-1- ( 4-Morpholinophenyl) -1-butanone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-1-propane, bis (2,4,4) - trimethyl benzoyl) - phenyl phosphine oxide, oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone), and the like.

In particular, those that do not color the resin composition include 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1- [4- (2-hydroxyethoxy) -phenyl]. Α-hydroxyalkylphenone compounds such as 2-hydroxy-2-methyl-1-propan-1-one, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxy) Acylphosphine oxide compounds such as benzoyl) -2,4,4-trimethyl-pentylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone) and these That combined is preferable.
In order to produce particularly thick sheets, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine A photopolymerization initiator containing an acyl phosphine oxide compound such as oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is preferable.
In order to reduce the odor of the sheet, oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone) is preferable. A plurality of these photopolymerization initiators may be used in combination.
The content of the (C) photopolymerization initiator used in the present invention is preferably 0.1 to 5 parts by mass, and 0.3 to 3 parts per 100 parts by mass of the total amount of the optical resin composition from the viewpoint of curability. More preferred are parts by weight, and particularly preferred is 0.5 to 2 parts by weight.

<Component (E): Organic peroxide having a 10-hour half-life temperature of 40 to 70 ° C. and a theoretical active oxygen content of 8% or less>
In the present invention, when a polarizing plate is provided on at least one of the panels of the display device, the 10-hour half-life temperature is 70 ° C. or less because the heat resistance temperature of the polarizing plate is about 65 ° C. Peroxides are preferred. Here, the 10-hour half-life temperature is a temperature at which the concentration of the organic peroxide decreases to half of the initial value after 10 hours. Further, from the viewpoint of viscosity stability, the 10-hour half-life temperature is preferably 40 ° C. or higher, and the theoretical active oxygen content is preferably 8% or lower.
The organic peroxide has a peroxide bond in the molecule, and the amount of active oxygen is used to express the concentration of the peroxide bond in the molecule, and the amount of active oxygen is expressed by the following equation.

特に純度１００％の場合の活性酸素量のことを理論活性酸素量とよんでいる。
このような有機過酸化物としては、例えば、１，１，３，３−テトラメチルブチルパーオキシ−２−ヘキサノエート（例えば、日本油脂株式会社製、商品名パーオクタＯ、１０時間半減期温度が６５．３℃、理論活性酸素量が５．８７％）、ビス（４−ｔ−ブチルシクロヘキシル）パーオキシジカーボネート（日本油脂株式会社製、商品名パーロイルＴＣＰ、１０時間半減期温度が４０．８℃、理論活性酸素量が４．０１％）、ジラウロイルパーオキサイド（日本油脂株式会社製、商品名パーロイルＬ、１０時間半減期温度が６１．６℃、理論活性酸素量が４．０１％）、ジコハク酸パーオキサイド（日本油脂株式会社製、商品名パーロイルＳＡ）、２，５−ジメチル−２，５−ジ（２−エチルヘキサノイルパーオキシ）ヘキサン（日本油脂株式会社製、商品名パーヘキサ２５Ｏ、１０時間半減期温度が６６℃、理論活性酸素量が７．４３％）、ｔ−ヘキシルパーオキシ−２−エチルヘキサノエート（日本油脂株式会社製、商品名パーヘキシルＯ、１０時間半減期温度が７０℃、理論活性酸素量が６．５５％）等が挙げられ、これらの有機過酸化物は複数を組み合わせて使用してもよい。
本発明で用いる（Ｅ）１０時間半減期温度が４０〜７０℃であり、且つ理論活性酸素量が８％以下である有機過酸化物の含有量は、遮光部の硬化性、粘度安定性、及び耐湿熱信頼性の観点から、光学用樹脂組成物の総量１００質量部に対して、０．１〜１０質量部が好ましく、０．３〜８質量部であることがより好ましく、０．５〜５質量部であることが特に好ましい。

In particular, the amount of active oxygen when the purity is 100% is called the theoretical active oxygen amount.
Examples of such an organic peroxide include 1,1,3,3-tetramethylbutylperoxy-2-hexanoate (for example, trade name Perocta O manufactured by Nippon Oil & Fats Co., Ltd., 10 hour half-life temperature is 65). .3 ° C., theoretical active oxygen content is 5.87%), bis (4-t-butylcyclohexyl) peroxydicarbonate (manufactured by NOF Corporation, trade name Parroyl TCP, 10 hour half-life temperature is 40.8 ° C. , Theoretical active oxygen amount 4.01%), dilauroyl peroxide (manufactured by NOF Corporation, trade name Parroyl L, 10 hour half-life temperature 61.6 ° C., theoretical active oxygen amount 4.01%), Disuccinic acid peroxide (Nippon Yushi Co., Ltd., trade name Parroyl SA), 2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane (Nippon Yushi) Product name: Perhexa 25O, 10-hour half-life temperature: 66 ° C., theoretical active oxygen content: 7.43%, t-hexylperoxy-2-ethylhexanoate (Nippon Yushi Co., Ltd., trade name) Perhexyl O, a 10-hour half-life temperature of 70 ° C., and a theoretically active oxygen content of 6.55%). These organic peroxides may be used in combination.
(E) The content of the organic peroxide having a 10-hour half-life temperature of 40 to 70 ° C. and a theoretical active oxygen content of 8% or less is used in the present invention. And from a viewpoint of heat-and-moisture-resistant reliability, 0.1-10 mass parts is preferable with respect to 100 mass parts of total amounts of the optical resin composition, It is more preferable that it is 0.3-8 mass parts, 0.5 It is especially preferable that it is -5 mass parts.

Moreover, in this invention, it is preferable that an organic solvent (solvent) is not included substantially from a viewpoint of heat-and-moisture resistance reliability and suppressing the bubble generation in hardened | cured material.
“Substantially” means that the organic resin is present in a trace amount (1% by mass or less) in the optical resin composition to such an extent that the post-curing properties of the optical resin composition of the present invention are not significantly deteriorated. It means that it may be good, but preferably it is not contained.

  The viscosity (25 ° C.) of the optical resin composition of the present invention is 500 to 5000 mPa · s, and is preferably 1,000 to 5,000 mPa · s from the viewpoint of bleeding out and workability. More preferably, it is 000 to 4,000 mPa · s. The viscosity is a value measured at 0.5 rpm from a E-type viscometer (RE-80L manufactured by Toki Sangyo Co., Ltd.) using a 3 ° cone rotor.

In the method for producing an image display device of the present invention, an image display unit having an image display unit and a protective panel are arranged to face each other, and the above optical resin composition is interposed therebetween, thereby the optical resin composition. A method of manufacturing an image display device that cures at least an optical resin composition between the image display unit and the protective panel, wherein the protective panel has a light shielding portion formed along an outer peripheral edge. It has the process of performing light irradiation from the panel surface side, and the process of heating an image display apparatus at 65 degrees C or less.
When the light shielding part is provided on the protective panel, sufficient light does not reach the resin filled between the image display unit and the protective panel, hindering curing, and the resin composition around the light shielding part is sufficiently cured. It does not proceed and the quality of the image display device is greatly impaired, leading to a decrease in reliability.
For this reason, in this invention, light irradiation is performed from an outer side surface side, and it hardens | cures in combination with the optical resin composition containing (A)-(E) component. In order to perform light irradiation from the protective panel surface side, for example, an ultraviolet irradiation device is used to protect the resin composition filled between the image display unit and the protective panel so as to be substantially perpendicular to the resin composition layer. Irradiate ultraviolet rays from the panel side.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples.
First, a production example of a resin composition that can be used in an image display device to which the present invention is applied will be described below.
Synthesis Example 1 (Synthesis of acrylic acid derivative polymer)
Take 575.0 parts by mass of methyl ethyl ketone in a reaction vessel equipped with a cooling tube, thermometer, stirring device, dropping device and nitrogen injection tube and replace with nitrogen at 150 ml / min. From room temperature (25 ° C.) to 100 ° C. for 50 minutes. Until heated.
Thereafter, while maintaining this temperature, 805.0 parts by mass of 2-ethylhexyl acrylate and 345.0 parts by mass of 2-hydroxyethyl acrylate were used as monomers, to which t-butylperoxy-2-ethylhexanoate 17 A solution in which 25 parts by mass was dissolved was prepared, and this solution was added dropwise over 150 minutes, followed by further reaction for 1 hour.
Subsequently, a solution in which 2.5 parts by mass of azobisisobutyronitrile was dissolved in 253.0 parts by mass of methyl ethyl ketone was prepared, this solution was added dropwise over 30 minutes, and the temperature was raised to 120 ° C. in 30 minutes after the completion of the addition. And further reacted for 2 hours.
Finally, methyl ethyl ketone was distilled off to obtain a copolymer of 2-ethylhexyl acrylate and 2-hydroxyethyl acrylate (weight average molecular weight 20,000).

Synthesis Example 2 (Synthesis of polyurethane acrylate)
In a reaction vessel equipped with a cooling tube, a thermometer, a stirrer, a dropping funnel and an air injection tube, 180 parts by mass of polypropylene glycol (molecular weight 2,000), 2.33 parts by mass of 2-hydroxyethyl acrylate, p-as a polymerization inhibitor Take 0.5 parts by weight of methoxyphenol and 0.05 parts by weight of dibutyltin dilaurate as a catalyst, raise the temperature to 70 ° C. while flowing air, and then 22.2 parts by weight of isophorone diisocyanate with stirring at 70 to 75 ° C. for 2 hours. The solution was uniformly dropped over the course of the reaction.
When the reaction was completed for 5 hours after completion of the dropwise addition, the reaction was terminated by confirming that the isocyanate had disappeared as a result of IR measurement. Polypropylene glycol and isophorone diisocyanate were used as repeating units, and polymerizable unsaturated bonds were formed at both ends. A polyurethane acrylate having a weight average molecular weight of 20,000 was obtained.

Example 1
50 parts by mass of acrylic acid derivative polymer obtained in Synthesis Example 1, 75 parts by mass of polyurethane acrylate obtained in Synthesis Example 2, 50 parts by mass of 2-hydroxyethyl acrylate, 6 parts by mass of acryloylmorpholine, 8 parts by mass of 4-hydroxybutyl acrylate , 1 part by mass of 1-hydroxy-cyclohexyl-phenyl-ketone (photopolymerization initiator), 1,1,3,3-tetramethylbutylperoxy-2-hexanoate (organic peroxide) (manufactured by NOF Corporation, 4 parts by mass of trade name Perocta O, 10-hour half-life temperature 65.3 ° C., theoretical active oxygen content 5.87%) were weighed and mixed by stirring to prepare an optical resin composition. The evaluation results of this resin composition are shown in Table 1.

(Example 2)
50 parts by mass of acrylic acid derivative polymer obtained in Synthesis Example 1, 75 parts by mass of polyurethane acrylate obtained in Synthesis Example 2, 50 parts by mass of 2-hydroxyethyl acrylate, 6 parts by mass of acryloylmorpholine, 8 parts by mass of 4-hydroxybutyl acrylate 1 part by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (photopolymerization initiator), di (4-butylcyclohexyl) peroxydicarbonate (organic peroxide) (Nippon Yushi Co., Ltd., trade name: Parroyl TCP, 10 One part by weight of a time half-life temperature of 40.8 ° C. and a theoretical active oxygen content of 4.01% was weighed and mixed by stirring to prepare an optical resin composition. The evaluation results of this resin composition are shown in Table 1.

(Example 3)
50 parts by mass of acrylic acid derivative polymer obtained in Synthesis Example 1, 75 parts by mass of polyurethane acrylate obtained in Synthesis Example 2, 50 parts by mass of 2-hydroxyethyl acrylate, 6 parts by mass of acryloylmorpholine, 8 parts by mass of 4-hydroxybutyl acrylate 1 part by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (photopolymerization initiator), dilauroyl peroxide (organic peroxide) (manufactured by NOF Corporation, trade name Parroyl L, 10 hour half-life temperature 61.6 The optical resin composition was prepared by weighing 10 parts by mass (° C., theoretical active oxygen amount 4.01%) and stirring and mixing. The evaluation results of this resin composition are shown in Table 1.

(Comparative Example 1)
50 parts by mass of acrylic acid derivative polymer obtained in Synthesis Example 1, 75 parts by mass of polyurethane acrylate obtained in Synthesis Example 2, 50 parts by mass of 2-hydroxyethyl acrylate, 6 parts by mass of acryloylmorpholine, 8 parts by mass of 4-hydroxybutyl acrylate , 1 part by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (photopolymerization initiator), 1,1-di (t-butylperoxy) cyclohexane (organic peroxide) (manufactured by NOF Corporation, trade name Perhexa C (10 hours half-life temperature 90.7 ° C., self-decomposition temperature 60 ° C., theoretical active oxygen content 12.29%) 4 parts by weight were weighed and mixed by stirring to prepare an optical resin composition. The evaluation results of this resin composition are shown in Table 1.

(Comparative Example 2)
50 parts by mass of acrylic acid derivative polymer obtained in Synthesis Example 1, 75 parts by mass of polyurethane acrylate obtained in Synthesis Example 2, 50 parts by mass of 2-hydroxyethyl acrylate, 6 parts by mass of acryloylmorpholine, 8 parts by mass of 4-hydroxybutyl acrylate , 1 part by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (photopolymerization initiator), 1,1-di (t-butylperoxy) cyclohexane (organic peroxide) (manufactured by NOF Corporation, trade name perhexyl PV (10 hours half-life temperature 54.6 ° C., self-decomposition temperature 25 ° C., theoretical active oxygen content 7.91%) 4 parts by weight were weighed and mixed by stirring to prepare an optical resin composition. The evaluation results of this resin composition are shown in Table 1.

A test method for each resin composition obtained in each example and each comparative example and a transparent sheet obtained by curing the resin composition is shown below.
(Viscosity stability)
The viscosity at 25 ° C. of the resin composition was measured using an E-type viscometer (RE-80L manufactured by Toki Sangyo Co., Ltd.). The resin composition used for viscosity measurement was sealed in a light-shielding polypropylene container, and then stored for 5 days in a state of being kept sealed at 25 ° C. And the viscosity of 25 degreeC was measured with the E-type viscosity meter after progress for a predetermined period, and the change rate of the viscosity after 25 degreeC / 5 day passage when the viscosity before sealing was set to 100 based on the measured value was computed. At this time, when the rate of change was 10% or less, the viscosity stability was high and good (◯), and when the rate of change exceeded 10%, the viscosity stability was evaluated as low and bad (x).

(Curable)
The resin composition is dropped onto the PET film, and another PET film is laminated so as to have a film thickness of 175 μm. The ultraviolet ray is radiated at 2000 mJ / cm ² using an ultraviolet irradiation device, and 65 ° C. in a convection oven. A transparent sheet in which the resin composition was cured by heating for 30 minutes was produced. At this time, a light shielding part having a width of 10 mm was formed on the outer periphery of the PET film on the ultraviolet irradiation side. The curability of the obtained cured product was evaluated with a finger.

(Moisture and heat resistance reliability)
The prepared resin composition is dropped on a 2-inch glass substrate, another glass substrate is bonded through a 175 μm spacer, and irradiated with 2,000 mJ / cm ^{2 of} ultraviolet rays using an ultraviolet irradiation device. A test piece was obtained by heating in an oven at 65 ° C. for 30 minutes. At this time, a light shielding part having a width of 10 mm was formed on the outer periphery of the glass substrate on the ultraviolet irradiation side. This substrate was placed in a test bath at 85 ° C. and 85% RH for 50 hours, peeled off, and visually evaluated for the presence of bubbles.
The test results of each example and comparative example are summarized in Tables 1 and 2.

  When the optical resin compositions (Examples 1 to 3) according to the present invention are used from Table 1, the viscosity stability at 25 ° C. is higher than when the resin compositions outside the scope of the present invention are used (Comparative Examples 1 and 2). It can be seen that the curing is sufficiently advanced even when the substrate is filled between the substrates having the light shielding portions. In addition, it was confirmed that there was no problem in the heat and humidity resistance test of the cured product obtained at this time.

Claims (6)

  (A) (meth) acrylic acid derivative polymer, (B) an oligomer having two or more ethylenically unsaturated bonds in the molecule, (C) a monomer having one ethylenically unsaturated bond in the molecule, ( An optical resin composition comprising: D) a photopolymerization initiator; and (E) an organic peroxide having a 10-hour half-life temperature of 40 to 70 ° C. and a theoretical active oxygen content of 8% or less.   2. The optical resin according to claim 1, wherein the content of the organic peroxide of the component (E) is 0.5 to 5 parts by mass with respect to 100 parts by mass of the total amount of the components (A) to (E). Composition. The (meth) acrylic acid derivative polymer of the component (A) is an alkyl acrylate having an alkyl group having 4 to 18 carbon atoms and the following general formula (I)

(In the general formula (I), m is 2, 3 or 4, n is an integer of 1 to 10.) The optical resin composition described in 1.   4. The optical component according to claim 1, wherein the oligomer having two or more ethylenically unsaturated bonds in the component (B) molecule is a urethane oligomer having two or more (meth) acryloyl groups. Resin composition. An image display unit having an image display unit and a protective panel are arranged to face each other, and the optical resin composition according to any one of claims 1 to 4 is interposed therebetween to cure the optical resin composition. A method for producing an image display device, wherein the protective panel is formed with a light shielding portion along an outer peripheral edge, and the optical resin composition between the image display unit and the protective panel,
(1) A step of irradiating light from at least the protective panel surface side;
(2) heating the image display device at 65 ° C. or lower;
A method for manufacturing an image display device including:   An image display device manufactured by the manufacturing method according to claim 5.